know which side one's bread is buttered on

== English == === Alternative forms === know on what side one's bread is buttered, know on which side one's bread is buttered, know what side one's bread is buttered on know what side of one's bread is buttered, know what side of the bread is buttered, know which side of one's bread is buttered, know which side of the bread is buttered === Pronunciation === === Verb === know which side one's bread is buttered on (third-person singular simple present knows which side one's bread is buttered on, present participle knowing which side one's bread is buttered on, simple past knew which side one's bread was buttered on or knew which side one's bread is buttered on, past participle known which side one's bread was buttered on or known which side one's bread is buttered on) (idiomatic) To be aware of where one's interests lie in a situation. === See also === butter one's bread on both sides